[pageonetoo]

and you have never taken anything that was not yours, or did anything else wrong.... Right!

The article says that the machine cannot be manipulated from the outside. To take advantage of this two soda deal isn't illegal, nor wrong. It was actually rather smart, since it was a two-fer deal.
I buy cartons of 12/12 oz. Pepsi cans at the store 5/$10.00. If I get two from a machine, the vendor will surely not go broke. If I lose a quarter or two, the vendor will surely keep it, since I usually can't find him. Get real with your pious attitude. It is just a mechanical error.

Lying, cheating and stealing are certainly absolutes, but this is not an absolute situation.
Sin, according to its proper definition, is "missing the mark", as an arrow shot at a bullseye. Any hit outside the bullseye is sin. Our lives are lived consistently outside the bullseye, for one reason or another, but God provided a remedy (To quote the Bible, John 3:16 comes to mind).
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[pageonetoo]

BTW, the teacher had the ability to control the error. He could have put a sign on the machine stating "out of order", and notified the vendor.

[Bob J]

If I get two from a machine, the vendor will surely not go broke.

Really? How do you figure that?

[Bob J]

The next time I buy a car I will insist the dealer give me two because surely, he won't go broke.